【单选题】According to the research of Yale and the University of Pittsburgh,
A.
there was a link between a company's success and the personality of its boss.
B.
There was no connection between a firm's success and its boss's personality.
C.
people could judge a professor's ability by watching short film-clips of lecturing.
D.
people could judge a professor's ability only after attending lectures for a full semester.
【单选题】欲配制pH=9.00的缓冲溶液最好应选用( )
B.
HAc- Ac - (pK a =4.74)
C.
NH 3 -NH 4 + (pK b =4.74)
D.
羥氨 NH 2 OH(pK b =8.04) 及其共轭酸
【单选题】欲配制pH=9.00的缓冲溶液,最好选用下列缓冲系中的( )。
A.
邻苯二甲酸(pKa1Θ=2.89;pKa2Θ=5.51)
【单选题】欲配制PH=9.00的缓冲溶液,最好应选用
B.
NaH 2 PO 4 -Na 2 HPO 4
【单选题】The distinciton between langue and parole was made by ________.
【单选题】欲配制pH=9.00的缓冲溶液,最好选用下列缓冲系中的( )
C.
Na 2 HPO 4 -NaH 2 PO 4
【单选题】欲配制 pH=9.00 的缓冲溶液最好选用:
C.
NaH 2 PO 4 —Na 2 HPO 4
【单选题】欲配制 pH=9.00 的缓冲溶液,最好应用的是
B.
NaH 2 PO 4 -Na 2 HPO 4
【单选题】欲配制pH=9.00的缓冲溶液,最好应选用
B.
NaH 2 PO 4 -Na 2 HPO 4